Why is Double Edge better than Hyper Beam.
Because you can switch out after you attack if you kill the opponent and the next opponent you face is something you have trouble with.
With Hyper Beam, you can't switch out even if you kill the opponent. So the next opponent will probably kill you and there's nothing you can do about it.
Ill switch lum berry with the item that wakes you up.
No, just use the standard set with Dragon Dance/Aerial Ace/Earthquake/Rock Slide
Salamence is normal to everything except zapdos.
Which is why you want Rock Slide.
Other 2 set moves have more than 1 thing it is week against.
No they don't. Aerial Ace and Earthquake cover everything in the game except for Zapdos, Skarmory, Aerodactyl, Solrock, and Lunatone. Rock Slide hits everyone of them for at least neutral damage.
Latios is normal to every pokemon in the game.
But Thunderbolt is better than Surf. You can defeat Water types more easily, otherwise they'll Ice Beam you. This goes double for Suicune, who has Calm Mind AND Ice Beam.
With Latios and Salamence you use Calm mind/Dragon Dance a until you are close to dying then use recover/rest to heal. then attack.
Won't work with Salamence due to its 4x Ice weakness. Ice is probably the most common type in the Battle Frontier and even things like Slaking have surprise Ice Beams.
You're thinking too simplistically, george. You have good ideas, but they aren't as effective as they can be.